a) $\frac{2}{5} \times \frac{1}{8} = \frac{{2 \times 1}}{{5 \times 8}} = \frac{2}{{40}} = \frac{1}{{20}}$
$\frac{5}{7} \times \frac{2}{3} = \frac{{5 \times 2}}{{7 \times 3}} = \frac{{10}}{{21}}$
b) $\frac{4}{7} \times 14 = \frac{{4 \times 14}}{7} = \frac{{56}}{7} = 8$
$6 \times \frac{4}{9} = \frac{{6 \times 4}}{9} = \frac{{24}}{9} = \frac{8}{3}$
c) $0 \times \frac{{11}}{7} = 0$ ; $\frac{3}{8} \times 0 = 0$
d) $1 \times \frac{6}{{17}} = \frac{6}{{17}}$ ; $\frac{{12}}{{19}} \times 1 = \frac{{12}}{{19}}$
